33
Subject to change without notice
28.4 ADD
In ADD mode the signals of both channels are algebraically added
and displayed as one sum signal. The Y-position can be changed
with both position controls. If one channel is inverted the diffe-
rence will be displayed. Only one ”0 V“ symbol ( ) will be shown
in the readout. The ADD mode will be indicated by placing a ”+“
symbol between the sensitivity indications of both channels.
Please note that the results of cursor measurements in this
mode will only be correct if the sensitivities of both channels are
identical, otherwise the readout will show ”CH1
<>
CH2“.
Automatic voltage measurements can not be performed in ADD
mode. The readout will show ”n/a“ = not available.
As the trigger signals are taken off the inputs and not from the
added signal there is no true reference for the trigger point
symbol, the symbol will thus be switched off. However, the
LEVEL A/B control
15
is active.
28.5 XY-mode
In this mode CH1 will move the trace in X direction, hence the
readout will show ”CHX..“, CH2 will move the trace in Y direction,
hence ”CHY...“ will be shown rather than ”CH2...“.
As the time bases are not involved in XY no time base related
information will be shown. Also the trigger circuits are disabled
so no trigger information is shown, either.
The magnifi er MAG x10
25
is disabled. The ”0-Volt“ symbols
will be shown as triangles at the right hand graticule and above
the sensitivities.
Both knobs, the HORIZONTAL
23
or the POSITION 1
9
will
move the trace horizontally. The Y-position is controlled by the
POSITION 2 knob
10
.
The CH1 signal can not be inverted, there is hence no menu item
in the CH1 menu (CH1 VAR pushbutton
27
). The TIME/DIV-VAR
24
knob is disabled.
28.6 Bandwidth Full/20 MHz
This pushbutton will select full or 20 MHz bandwidth.
Full:
Full bandwidth will be the one given in the specifi cations.
20 MHz:
Provided measuring modes allow full bandwidth (i.e.
≥
5 mV/cm)
this can be reduced to 20 MHz (–3 dB) in order to attenuate high
frequency noise e.g. The readout will show BWL = bandwidth
limited. The bandwidth limitation affects both channels.
29
CH2 VAR
(pushbutton)
This pushbutton opens the CH2 menu which offers the following
options:
29.1 AC DC
The pushbutton will alternate between AC and DC coupling.
The readout shows a ”~“ or ”=“ symbol behind the sensitivity
indication.
29.1.1
DC coupling
The signal will be directly coupled to the input amplifi er via
the BNC connector
35
and the input attenuator. The input
resistance of the scope is a constant 1 MΩ irrespective of the
sensitivity selected.
29.1.2
AC coupling
A capacitor is inserted between the BNC connector and the at-
tenuator, thus the DC content of the signal is blocked and a high
pass with a lower cut-off frequency of approx. 2 Hz is created.
Low frequency signals will thus be more or less differentiated,
hence their shape and amplitude affected.
If the DC content of the signal changes, e.g. the duty cycle of
pulses, the capacitor must charge or discharge. This will cause
a momentary Y shift of the display.
HM 1
0
0
0-2 - KLB - Stand: 07/1
2/06 gw
HM1
0
0
0 - blau - Stand: 07/1
2/06 gw
HM
10
0
0
-2
- gr
ü
n -
St
an
d
:
07/1
2/06
gw
VAR
VAR
VAR
x10
FOCUS
TRACE
VOLTS / DIV
VAR
VOLTS / DIV
VAR
TIME / DIV
VAR
X-POS
INTENS
!
LEVEL A/B
MENU
AUX
AUXILIARY INPUT
HORIZONTAL
INPUTS
1M
Ω
II15pF
max
400 Vp
CAT I
!
CAT I
!
DELAY
TRACE
SEP
CH 1/2
CURSOR
SAVE/
RECALL
AUTOSET
SETTINGS
HELP
POSITION 1
POSITION 2
VERT/XY
HM1500-2
ANALOG
OSCILLOSCOPE
150 MHz
TRIGGER
MODE
FILTER
SOURCE
TRIG
’
d
NORM
HOLD OFF
AUTO
MEASURE
CURSOR
MEASURE
TRIG. EXT. / Z-INP.
CH 1
CH 2
X-INP
CH 1
CH 2
HOR
MAG
1M
Ω
II
15pF
max
100 Vp
20 V
1 mV
20 V
1 mV
0.5s
50ns
POWER
POWER
MENU
MENU
OFF
OFF
1
2
3
4
5
8
7
6
9
10
11
13
12
14
15
22
23
16
17
24
18
21
25
26
19
20
27
30
28
29
31
32
33
37
C o n t r o l s a n d R e a d o u t
